So in game you can find flu shots to give yourself immunity to the flu. I was thinking that there is another injectable which would be nice to have: Allergy shots. They could be rare, and used to permanently remove existing allergy traits, such as Wool Allergy or Junkfood Intolerance. In real life you typically need them regularly, or at least a series of shots, but I’m thinking since this takes place in near future, it could be a next generation treatment, requiring only one shot (I’ve seen some work that has been done on this in real life as well, for peanuts).
They might be allergy specific for balance purposes, and you would need to find a different shot type for each allergy.